After 10,000 years of imprisonment, the evil sorceress Rita Repulsa and her loyal minions are freed when astronauts on a routine mission in space accidentally open her dumpster prison on the moon. Filled with rage, Rita decides to conquer the nearest planet Earth. But her arch nemesis - the heroic sage Zordon - has been patiently waiting in preparation for this day. With the assistance of his wisecracking robotic sidekick Alpha 5, Zordon recruits a team of `five teenagers with attitude' - Jason, Zack, Kimberly, Billy and Trini - to receive superpowers beyond their wildest dreams and defend the Earth as the Mighty Morphin Power Rangers. Aided by giant robotic vehicles modeled after dinosaurs called Zords, the Power Rangers fight back the evil alien hordes of Rita Repulsa.